Universal jolt-ramming machine for core-boxes.



8 SHBETSSHEET 1.

INVENTOI? Patented Feb. 28, .1911.

x A55 L l l I 4 I Illllll lmllllllllllllfllll v T. P. SISSON. UNIVERSALJOLT BAMMING MACHINE FOR CORE BOXES.

APPLIUATION FILED 00123, 1910.

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WITNESSES.

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- ATTORNEY T. P. SISSON. UNIVERSAL JOLT RAMMING MAGHINE FOR GORE BOXES.

4 APPLICATION FILED OUT. 3, 1910. 95,464. 1 Patented Feb. 28, 1911.

2 SHEETS-SHEBTZ.

WITNESSES: I

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THOMAS F. SISSON, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR '10 ALFRED J.MILLER, OF PROVIDENCE, RHODE ISLAND.

"UNIVERSAL JOLT-RAMMING MACHINE FOR CORE-BOXES.

Specification of Letters Patent.

Patented Feb. 28, 1911.

Application filed October 3, 1910. Serial No. 584,985.

To all whom it may concern:

Be it known that I, THOMAS F. SISSON, a citizen of the United States,residing at the city of Providence, in the county of Providence andState of Rhode Island, have invented certain new and useful Improvementsin Universal Jolt-Ramming Machines for Core-Boxes, of which thefollowing is a specification, reference being had therein to theaccompanying drawing.

Machines for automatically ramming the sand for making molds have beenmade and are in use, such machines usually employing pneumatic mechanismfor operating the table on which the boxes are placed, but such machinesare expensive in structure and operation, and are not thoroughlyeffective for use with core boxes unless the latter are of the simplestnature. Therefore it is still the general practice to ram the sand incore boxes by hand.

The object of the present invention is to provide a mechanicallyoperated jolting or jarring machine which will efliciently ram the sandfor the making of all kinds of cores.

To this end the invention consists in the construction and combinationof parts substantially as hereinafter described and claimed.

Of the accompanying drawings: Figure 1- represents a vertical sectionthrough a machine embodying my present improvements, the line of sectionbeing taken substantially through the center of Fig. 2. Fig. 2 is afront elevation of themachine, the hand operated shaft for shifting thecams being shown in section. Fig. 3" is an under plan view of the tableand its post, removed from the machine. Figs. 4 and 5 are detail sideelevations of two of the cams for lifting the table. Fig. 6- representsa section on line 66 of Fig. 1. Fig. 7 is a diagram to illustrate theaction of the cams on the tappets of different height or length whichproject downwardly from the table. Fig. 8 is a top plan view partiallyin section, illustrating the operation of the guide arm 44.

Similar reference characters indicate the same or similar parts in allof the views.

Rising from a suitable base 10 is a tubular standard 11, said standardreceiving the post 12 of the table 13. An annuhis or heavy washer 14,preferably of Wrought iron, is inserted between the top of the standard11 and a flat undersurfacc of the table around the post 12 to receivethe impact or blow of the table when it descends by gravity after havingbeen lifted by the cam mechanism presently described.

Projecting downwardly from the table are tappets 15, 15 15 and 15 saidtappets being preferably provided with anti-friction rolls 16. Thetappets are arranged in a circular series and have different lengths fora purpose hereinafter described. By different lengths I mean that thelower ends of the tappets or the rolls carried thereby are in differenthorizontal planes. To illustrate this in the clearest manner, thediagrammatic view Fig. 7 is presented. In practice I have constructedthe table with two diametrically opposed tappets 15 the length beingsuch that the rolls 16 thereof will give a two inch lift to the tablewhen the cams presently described engage those two tappets. The othertappets 15 15 and 15 in such machine as constructed are of a length tocause the table to be lifted one and onehalf inch one inch, and one-halfinch, respectively, as will be more fully explained hereinafter. Therebeing eight tappets, they are arranged of course in two series so thatthe two tappets 15 will be diametrically opposite each other, thetappets 15 diametrically opposite each other, the tappets 15diametrically opposite each other, and the tappets 15 diametricallyopposite each other.

The base 10 is provided with two side standards 17. In a hearing at theupper end of each standard 17 is supported the outer end of a shaft 18,the inner end of each shaft 18 being mounted in a bearing formed in anupper side portion of the standard 11. Fixed to each shaft 18 is a gear19, said gears meshing with pinions 20 on a counter shaft 21 supportedin suitable bearings provided in the standards 11 and 17, said shaft 21being driven by any suitable means such as a belt or a pulley 22 (seeFig. 2). Splined on each shaft 18 so as to rotate therewith but capableof being adjusted longit-ljidinally thereof are two cams 23 and 24 (seeFigs. 2, 4c, 5 and 7.). The cams 23 are five-pointed, while the cams 2stare threepointed. Each pair of cams 232 l are so Connected or formedthat they are simultaneously shifted longitudinally of the shaft 18. Asindicated in Fig. 2 the hub or sleeve carrying the cams is provided witha ring or collar 25 within which such hub may rotate, each ring beingprovided with a pin 26. Mounted in a bearing provided in the front sideportion of standard 11 is a shaft 27 having ahand wheel 28 at its outerend. Secured to said shaft 27 is a hub having two arms 29, said armsbeing connected by links 30 with the pins 26 of collars By rotating theshaft 2? so as to carry the arms 29 from the full line to the dottedline position shown in Fig. 2, the said arms act through the links 30 toshift each pair of cams so that the cams 23, instead of the cams 2%,will be in position to act upon the tappets of the table. To hold theshaft 27 in either one of its positions of adjustment, the hub of thearms 29 may be provided with recesses 31 either one of which may beentered by the tip of a spring pressed bolt 32. The lower end of thepost 12 is formed with eight vertical grooves 33 (see Figs. 1 and 3)either one of which may be engaged by a bolt 34. Said bolt, as shown inFig. 1, has an enlargement or block 35 mounted to reciprocate in a suitable guideway formed'in a projection of the standard 11, said block andits bolt being pressed forwardly by a spring 36. The block is formedwith a recess 37 in its underside, said recess being engaged by a pin 38rising from a lever 39 pivoted in a standard at 4 0. and having a footpiece al at its front end. The rear end of the lever projects into thestandard 11 below the post 12 and is preferably provided with a roll L2.A spring 43 holds the lever normally in the position shown by full linesin Fig. 1.

When the parts are in the positions indicated by full lines in Fig. 1,and when power is supplied to the shaft 21, the shafts 18 are rotatedand the three-pointed cams 24: act on the tappets 15* and lift thetable, the latter being guided and prevented from rotating by means ofthe bolt 3% entering one of the grooves 33. Any core boxes mounted onthe table will be vertically reciprocated, and

the drop will be considerable each time that the cam points pass thetappets. The extent of drop and the jar resulting from the impact of thetable on the annulus 1% will quickly jar or jolt the sand thoroughly andefliciently in the core box or boxes. Differs ent sizes, shapes or formsof core boxes require different treatment, some requiring less verticalmovement than others. Since the table can never descend below a certainplane, rotative adjustment of the table so as to bring a different pairof tappets in position to be acted upon by the cams, will result invarying the force of impact because the tappets of lesser height. whenin position over the cams, will result in the table being lifted alesser amount. As an illustration of the need for varying the amount ofimpact which is controlled by the rotative adjustment of the table andits tap pets, it may be mentioned that when a core box includesconsiderable wood in its construction, the blow is softened or muffledby the wood and in that case a heavier jar is required.

The operation for forming some cores should be more rapid than others.By mounting cams such as those shown at 23 and 2% so that they can beinstantly adjusted, the desired or necessary change of speed is quicklyeffected. Since the points of the cams cannot, of course, be inalinement, and since. the table cannot be rotated to change itsadjustment when in lowered position, the lever 39 is provided. When achange is to be efi'ected, the operator depresses the outer end of thelever so that the inner end, or the roll 42 carried thereby, will engagethe lower end of the post 12 far enough so that the tappets of the tablewill clear the cams. This manipulation of the lever also causes the pin38 to withdraw the bolt 34: so that the table can be rotated to bringany desired pair of tappets in position to be acted upon by the cams.And of course while the table is elevated, the cams may be shifted bymeans of the hand shaft 27.

The collars 25 on the hubs of the rotatable cam 24 are held againstrotation, but permitted to move longitudinally on said shaft, by meansof the arm 44, which arms are pivoted at 4C5 at one end to the arm 46,extending rearwardly from the standard 11 and are forked and slotted atthe opposite end to engage pins 44: in the collar It is found inpractice necessary to hold these collars 25 against rotation in orderthat the longitudinal movement of the cams may be effected through themand the connecting links 80 in the manner above described.

It will be understood of course that as many core boxes as the tablewill hold may be simultaneously treated to jar or jolt the sand firmlyto position, so as to require no hand ramming.

I claim: 7

1. A machine of the character described comprising a vertically movabletable, cam and tappet mechanism for raising it, an abutment to receivethe impact of the table when the latter descends by gravity, the cam andtappet mechanism being variable to change the plane to which the tableis elevated, and means whereby the extent of the repeated elevations ofthe table may be lgept uniform for an indefinite length of time.

2. A machine of the character described comprising a vertically movabletable, a circular series of tappets carried by said table, and two pairsof cams of diiferent contour to act on said tappets to raise the table,the

cams being interchangeably mounted and shiftable to bring either pairunder the tappets.

3. A machine of the character described comprising a vertically movabletable having a circular series of t-appets, two pairs of cams ofdifferent contour for acting on said tappets to raise the table, thecams being interchangeably mounted and shiftable to bring either pairunder the tappets, and an abutment to receive the impact of the tableWhen the latter descends by gravity.

4. A machine of the character described, comprising a vertically movabletable having a circular series of tappets of difierent height, means forrotatively adjusting the table, a pair of cams to act on said tappets toraise the table, and an abutment to receive the impact of the table whenthe latter de scends by gravity.

5. A machine of the character described, comprising a vertically movabletable having a circular series of tappets, and a plurality of cams ofdifferent forms for acting on said tappets to raise the table, meansbeing provided for shifting the positions of said cams.

6. A machine of the character described, comprising a vertically movabletable having a circular series of tappets, two pairs of cams under thetable, the cams of each pair diiltering from each other in form, meansfor simultaneously rotating said cams, and means for shifting thepositions of said cams to interchange them as to their operative positions relatively to the tappets.

7. A machine of the character described, comprising a tubular standard,a post mounted in said standard and having a table at its upper end,said table having a circular series of tappets of dilterent heights, thepost being formed with vertical grooves, a movable bolt to engage eitherone of said grooves, and cams for cooperating with the tappets to raisethe table.

8. A machine of the character described. comprising a tubular standard,a post having vertical grooves and mounted in said standard, a tablecarried by said post and having a circular series of tappets ofdifferent heights, a bolt adapted to enter either of the grooves in thepost, a lever having an arm extending under the post and having aprojection to actuate the bolt to withdraw it, and cams to cooperatewith said tappets to raise the table.

In testimony whereof I ailix my signature in presence of two witnesses.

THOMAS F. SISSON.

\Vitnesses HOWARD E. BARLow, E. I. OGDEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). C.

